[13.x] Remove redundant auth code columns

[hafezdivandari]

We are unnecessarily persisting scopes, client_id, and user_id to oauth_auth_codes table. These values are encrypted on the auth code itself and we have absolutely no usage for them.

Why?

• Updating these values doesn't have any affect on the auth code, e.g. if one changes the scopes value, the auth consent form doesn't change, because the real scopes are decrypted from the code itself not from DB.
• The code is useless if the associated client or user have been deleted, so there is no need to manually delete them by user_id or client_id. Auth codes are short-lived (always 10 mins) and will be expired and purged from DB after that.
• There is no usage for them, completely redundant. We just store them on DB and never retrieve these values.

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[taylorotwell]

Let's just leave it. Otherwise it's a pointless breaking change.